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(Wired)   Skynet helped uncover over 900 Chinese boats hiding in Best Korean waters, says it's "contented" with is progress on hunter-seekers for the moment   (wired.com) divider line
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1128 clicks; posted to Fandom » on 27 Jul 2020 at 1:07 PM (13 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



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2020-07-27 11:43:26 AM  
i.imgur.comView Full Size
 
2020-07-27 11:56:47 AM  
FTFA:
AIS is a tracking system, much like GPS, that uses transponders to send the vessel's location at sea. Although it provides detailed movement information, only a fraction of vessels that use GPS broadcast their positions. "Most of the vessels operating do not use this and are 'dark,' meaning they don't appear in public surveillance systems, and the ones that did broadcast did so relatively infrequently," says David Kroosdma, director of research and innovation at the international nonprofit Global Fishing Watch and coauthor of the study. The ones that did broadcast AIS all originated from Chinese ports and fished in Chinese water.

1.  AIS is a tracking system that *USES* GPS.  GPS is a purely passive system from the users standpoint.  You simply have a receiver and that receiver doesn't transmit anything.

2.  A transponder is a device that detects an incoming signal and then responds.  It is a portmanteau of "transmitter" and "responder".  AIS doesn't do that, it radios the location of the vessel using it "in the blind".

3.  AIS is sent over the VHF Marine band, which limits its range for terrestrial monitoring, something not mentioned in that paragraph.

4.  However, it can easily be monitored from satellites in space, something also not mentioned in TFA.

Of course, the implication is that vessels doing something illegal don't want to be tracked, much like why the various navies often turn off AIS when on maneuvers at sea but turns it back on in crowded waters.

But it bugged me that I saw so much wrong in that one paragraph.
 
KIA
2020-07-27 1:20:08 PM  
Hey, fish down by 82% and no attempt whatsoever to manage ecosystems or prevent total extinction.

Hooray for China?
 
2020-07-27 1:46:22 PM  
Wow.  China is doing something unethical and against international treaty?  I'm shocked.

They seem to have dealt with that pre-Tienanmen protester problem though.
 
2020-07-27 2:15:48 PM  

AngryDragon: Wow.  China is doing something unethical and against international treaty?  I'm shocked.

They seem to have dealt with that pre-Tienanmen protester problem though.


User name checks out.
 
2020-07-27 4:12:50 PM  
Speaking of fish, isn't it about time for our periodic "misrepresented fish" thread again?  I lost count at how many there have been, but I think 3 or more.
 
2020-07-27 6:30:33 PM  
farking Chi-Coms...fark those guys, seriously.
 
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